George f



y 'ltnted tant GEORGE F. MCCLEANE, OF PITTSBURG, PENNSYLVANIA.

Letters Patent No.'104,177, datcd'lzme 14, 1870.

IMPROVEMENT IN- 'OUR-IGH ROLLS FOR ROLLING METAL.

The Schedule referred to in these Letters Patent and making part of the .same

To all whom 'it may concern:

Be it known that I, GEORGE F. MoCLEANi-i, ofthe city of Pittsburg, in the county of Allegheny and State of Pennsylvania, have inyented a new and. useful I mprovement in Four-High Roll and I do hereby declare the following to be a full, clear, and exact description thereof.

My improvement is designed' for rolling thin sheets of iron, in order to give them a fine, smooth surface, and draw them out to the degree of tennity required.

In order to secure the desired-results'to the greatest advantage, it is vrequisite to apply great pressure to the rolls by means of` screws bearing on the pressureblocks, in the housing or framework which carries the journals of the rolls. To this end,tl1e rolls are screwed down until their bite is less Vthan the thickness of the pack of' three or four sheets to be passed between them, and, as in,v rolling sheets of considerable width, tbe rolls have to be correspondingly long, they must, where only a pair of rolls is used,l be of' sufficient di'- ameter to aii'ord the requisite strength to resist the strain equally at all points in their length, as otherwise, if the rolls should yield tothe tendency to spring in the middle, the pack of sheets would be, rolled thicker in the middle than at the edges, and thus be be spoiled. But rolls of considerable thickness have practically too broad or bearing-surface on the sheets passed'through between them, to produce a good result, and it is almost impossible to roll very thin sheets of'iron by means of such apparatus,

To obviate this difficulty, the device of three-high rolls, as they are called, has been used, consisting of a set-.of three rolls with their axes in the same vertical plane, and the middle roll beingof less diameter than the outside or upper and lower rolls, thereby securing the bearing and resisting supportof the heavy large diameter-rolls with the narrow bite of' the small diameter-roll.

This device, however, does not effect the desired result so satisfactorily as does my device, which 1 will lproceed to explain, with reference to the accompanying drawing making a part hereof', in which- Figure 1 is a front elevation of four-high rolls, mounted in ahousing;

Figure 2 is an end view thereof', more perfectly illustratingfthe relative position of the rolls;` and Figure 3 is a vertical cross-section through the line l :c x, fig. 1.

Like letters of reference indicate like parte in each. In the housings b and in boxes or bearing-blocks a c are mounted the four-high rolls c c (l d', two of which, d d', the top and bottom rolls of the set, are of suiciently large diameter to resist the strain or pressure of the working rolls c c placed between them, and prevent the springing or ,yielding of' the working-rolls c cf, which are of' smaller diameter than the rolls (l d.

The bearing-blocks a', which carry the rolls c c', are so set that the line of' bite of the rolls c c shall be a little forward of the vertical plane in which lies the axes ofthe upper `and lower rolls (l d', and, by the use of wedges e, set-screws, or other known means effect: ing such adjustment, this line. of bite of' the rolls c o may be set forward a greater or less distance, as may be desired.

It is not designed to passthc pack of 'sheets f back and forth between the rolls c and-c', nor between either of the large diameter-rolls d or tl' and 4its adjoining small diameter-roll c or c', but only in one direction,

as indicated by the arrow in the drawing, the reasolr for this being that, even with the "ertical support of the large diameter-rolls d and d', if the four rolls had 'their axes in thcsame right line, there would be-a tendency of the smaller rolls c c' to bend and slip forward in the middle, and thus injure tire bite of' the rolls and spoil the sheets being rolled.

To overcome this tendency, as already mentohed, v

I set the two small diameter working-rolls, with their axes, in a line,.z z, parallel.\vith the line z z,1n'wh1ch the axes of the large diameter-rolls are set but slightly forward of that line, so that the large diameter-rolls may usually have a nearly vertical bearing on theI smaller or working-rolls, but also a sufficiently horizontal or lateral bearing to resist any tendency of the smaller rolls to slip forward, or, in other words, .t-hc rolls c c being subject toinot only a vertical, but also a lateral strain in consequence of their reducing action on the pack j', this lateralV strain being in a direction.

opposite to the feedingfside of the rolls, 'or in thedi-l rec-tion indicated 'by the arrow, the rolls c c are supported against the tendency to spring or bend `1n both directions, by'upper and lower rolls d d'. Such support is the result oftbe arrangement described. arrangement has also the eti'ect to increase slightly the pressure of the rolls on the pack of sheets as it is passed through between them in the direction indicated by the arrow in the drawing.

fhat I claim as my invention, and desire to secure by Letters Patent, is

The arrangement hereinbef'ore described of the pair of working-rolls cc' and the pair of supporting-rolls d d', the. former being of less diameter than the latter, and located in a vertical plane somewhat in advance of the supporting-rolls, substantially as and for theA purpose set forth.

In testimony whereof, I, thesaid GEORGE F. MC- OLEANE, have hereunto set my hand.

GEO. F., MCGLEANE.

Witnesses JOHN GLEN'A, Taos. B. Kann.

This 

